Sony st s 7 service manual

Page 2

ST-S7

General
Power requirements US model: 120V AC, 60Hz
AEP, Germany, Italian model: 220 -230V AC
UK model: 240V AC, SD/GOHZ
(or 240 V AC adjustable by authorized Sony
personnel). 50/60 Hz

Power consumption 10 W

AC outlet 1 unswitched, 120 W max,

Dimensions Approx. 430 X 95 X 360 mm (w/h/d)
(17 x 33/4 x 14% inches)

Weight Approx 4.7 kg (10 lb 6 oz)

Accessories supplied Connecting cord (1)
FM ribbon antenna (1)
AM loop antenna (1)
Antenna connector (1 )

Desrgn and specifications subject to change without notice,

MODEL IDENTIFICATION
-Specification Label-

SONY; MODEL N0. ST-s7

FM STEREO/FM-AM TUNER

WWW

SERIAL NO.
MADE IN JAPAN

US model: AC 120V 60Hz 10W
AEP, Germany, Italian model : AC 220-230V ~ 50/60 Hz
UK model : AC 240 V ~ 50/60Hz

TABLE OF CONTENTS

Section Title Page
Specifications ------------------------------------- 1
Safety check-out ------- , 2
Model identification . 2
SECTION 1. GENERAL
1-1. Location of Controls ---------------------- 3
SECTION 2. ELECTRICAL ADJUSTMENTS ---- 4
SECTION 3. DIAGRAMS
IC701 System Controller (TMP47C870N-4684) ~~~~~ 6
3-1. Block Diagams ............................. 7
3-2. lC Block Diagrams -------------------------- 9
3-3. Semiconductor Lead Layouts -- ~ ~ - - ~ - ~ - - -~ l0
3-4. Printed Wiring Boards ~ ~ ' . ~ ~ ~ ll
3-5. Schematic Diagarn """""""""""""""" 13
SECTION 4. EXPLODED VIEW """""""" 17
SECTION 5. ELECTRICAL PARTS LIST ------ 19

SAF ETY CHECK-OUT

After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below

LEAKAGE TEST

The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods

It A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the

manufacturers instructions to use these instru-

ments.

2 A battery-operated AC milliammeterr The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measuring the voltage drop across a resistor by

means of a VOM or battery-operated AC voll-
meterr The limit" indication is 075 V, so
analog meters must have an accurate low-
voltage scale The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable, Nearly all battery operated digital
multimeters that have a 2 V AC range are
suitable (See Fig A)

Ta Exposed Metal
Parts on Set

{g 1.5m /
J

A C
voltmeter
I 0. 75 V}

0.15uF

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BV MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

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